Automatic rotary scraper



Aug. l2 1924.

R. C. HAWKINS AUTOMATIC ROTARY SCRAPER 1923 2 Sheets-Shes!I l Fi led June 7 lllllllilllll! jiu! Aug. 12, 1924 v V1,504,820 R. c. HAwKlNs AUTOMATIC ROTARY SCRAPER Filed June '7., 1923 2 Sheets-'Sheet if? Patented Aug. 12, 1924.

UNITEDl STATES non c. HAwKINs, or LONG BEACH, CALIFORNIA.

AUTOMATIC :ROTARY SCRAPER.

l Application ined June 7, i923. serial No. Masas;

f this invention to'provide a scraper resemthat the scraper may, however, be dragged bling the Fresno type with novel means to faci itate the loading and the gradual unloading or sudden dumpin of the same.

It is an object of this invention to rovide a scraper ,of the character referre to with means permitting at will either a complete rotation of the scraper bowl, in order to dump the contents in a single pile or, alternatively, a gradual or distributing or leveling delivery of the contents of said bowl, my preferred construction being such any desired distance either with its owl full or with its bowl inverted, and such that the bowl of my scraper may easily be positioned for filling, such positioning being effected without the necessity for any backing or other diiicult movement.

It is an object of this invention to provide. means whereby my scraper may be variously hitched, in accordance with the requirements of different tractors, or the like, or in accordance with the requirements of ldifferent soils or situations in which my scraper may be used; and the bowl yof my scraper is preferably provided with wheel-like ends, .and with pivots on said ends, said pivots being, in one embodiment nof my invention, adapted to extend through slots in the frame by which my scraper may be drawn,-this frame being preferably so constructed as to provide bearings and guards for all operating parts.

provide a sera er comprising a com aratively simple rame and av simple owl, which may be of known design except as hereinafter stated, and comparatively few and rugged operating posed to accidental rangement; and in a referred construction I employ a single liand lever, ywithin reach of the driver of a tractor by which my scraper ma be drawn, and I may utilizey a single pair of parts, not unduly exshown as springs, or the like, and suitable connections, either to cause the bowl of my scraper to pickup a load or to dump the' same or to remain .filled or remain empty during its advance to any desired distance.

Other objects of my invention will appear from the following description' of alternative embodiments thereof, and from the appended claims, taken in connection with the accompanying drawings, in which-- Fig. 1 is a plan view of a scraper of my improved design. v

Fig. 2 is a side elevation of the same, with parts sliown in that relative position which they would occupy during the picking vup of a load.

Fi 3 is a similar view of my scraper, but showin the' parts in those relative positiohs w ich they would occupy during the` giadual or scraping or levelin'gdelivery of a load.

Fig. 4 is an 'additional View of the same scraper, but showing parts in that relative position which they might occupy after a su den dumping.

Fig. 5 is a side elevation of an alternative form hereinafter described.

Referring to the details of that specic form of m'y invention illustrated in Figs. l to 4 inclusive, 1 is a scraper bowl, which may be similar to the bowl "used in a Fresno scraper but which is provided `with arcuate shoes 2, which may be bolted or otherwise secured thereto in such manner as to ive the ends of the bowl a substantial y circular outline, i except as the flatness of the `bottom 3 of the scraper bowl may be re arded as an interruption of the mentione circularV outline; and this bowl is provided with pivots 4, which may be substantially. at the center of curvature of the shoes 2, these pivots'being adapted to provide a int of attachment fora main frame,

, by which my scraper may be drawn by a It is a'further object of this invention to tractor, or the like. l lthou h 'various alternative constructions mig t be employed, I prefer to. form the mentioned .main frame from a pairof bent draft members 5, whose inner front ends 6 may be secured to etherand to a hitch plate 7 (secured a so by dia onal straps 7*) their outer rear ends 8 eing bent into parallel planes land as spaced apart by a brace 9, ada ted to withstand horizontal stresses and o such length as to permit* of the interposition of operat lio i ing a hand lever 11, shown as ing parts between the respective ends of the scraper bowl and the mentioned parallel outer portions of the main frame, which may be provided with circular or slotted openings l'O, to receive the ivots 4, upon the ends of said sera er bow In -order suita 1y to control the position of the bowl 1 relatively to the described main frame, I may provide means comprisivoted at 11l near the front of the main ame and within'reach of the driver of a tractor by which my scraper may be drawn, this lever being shown as connected lby a rod 12 with an intermediate'lever comprising as its ful- .crum the rock shaft 13, shown as extending through bearing openings 14 in the parallel portions 8 of the main frame and as steadied by' bearing arms 15, secured 'to the brace 9, one arm 16 of the mentioned intermediate lever being fixed to the rock 12,and the other arms 17 thereof shaft 13 and pivoted to the connecting the main draft frame of my scraper, is provided at its free end with means such as a notch 22, adapted to be engaged with or disengaged from pins or projections 23, 24,

angularly spaced apart upon the respective ends vof the scra er bowl, resilient positioningmeans suc as the spring 25, shown as secured to said locking arm and to the main frame of my scraper, being employed normally to holdfeach arm 20 in engaging position. Each locking arm 2O being provided with an offset or e uivalent en aging surface 26, with which te cam surace 19 of the arm 18 may have a sliding contact, it will be obvious that the rearward movement of thehand lever 11 .may be effective to throw both of the locking levers 20 out of engagement with the respective projections 23, although an immediate release of4 thehaid lever l11 may permit aprompt engagement of the notches 22 therein with the pins or projections 24, after the bowl of my thereby effected.

'After a load has been dumped, the parts of my scraper may be permitted to advance to the relative positions shown in Fig. 4, in which my scraper may be dragged empty for any desired distance, it being understood that, after the arms 2O shall again snap into engagement with the projections 23, the bowl is held and drawn forward largely by the engagement of the said projections in the' notches l22, a short horizontal slot 27 being preferably provided at one end of the st-rap 18, havin a pivotal connection with the arm 17 an with the scraper bowl, in order that, as my scraper is drawn over uneven ground, tlie bottom of the bowl may conform to and slide over the undulations in the ground, without necessaril cutting the tops ofi' f-rom high spots or lling the low spots encountered during the advance of my scraper. f

en a new load is to be picked up, it is necessary that the leading edge 28 of my scraper shall be given a downward inclina-A tion; and it is an important feature of the described construction that a forward movement of the hand lever 11 may be immediately effective to cause a suitable tilting of the bowl of my scraper, for the reason that the elevation of the normally horizontal arm 17 of the intermediate lever coniprising rock shaft 13 is eifective, through strap 18, to advance the ivots 4 upon which the said bowl is mountedtipping the entire bowl forward upon thep rejections 23, as pivots, the drag of the oad picked up by the' scraper bein immediately effective, as soon as the hand e 11 is released, to restore all partsV to the normal position shown in Fig. 2.

Especial attention is called to the shifting of tliedraft line from the pivot 4 to the pins 23 when the bowl rotates and the bottom 3 startsto dig into the ground to pick up a load. At this time the pressure against the cuttingedge of the bottom 3, which is slightly belo'vs7 the pins 23, will ,throvv7 the bowl, including the pivots 4, forwardly in slots 10, and as soon as the cutter picks up a load the load will move backwardly over thebottom 3 and upwardly into the bowl and the weight of the load will move the pivots 4 backwardly in the slots 10, thus bringing the bottom 3 to a level position.

Especial attention is further called to the fact that there is a primary draft rig ing leading to the pivots- 4 and a secon ary draft rigging leading to the pins 23 and manually operative means for shifting the load from the primarydraft rigging to the secondary draft rig ing at the time the cutter is to dig into t e ground. One object is to get the line of draft direct to the cutter at the time the cutter is doing the hard work.

It is believed that all essential features Fig. 5. In that embodiment of my inven tion last referred to, the bowl and the main frame being of the general character already described, an intermediate lever and a locking arm of somewhat different construction and operation are employed, the said intermediate lever havin as its fulcrum 'a rock shaft 13a, from W ich one arm 16a normally extends upwardly and rearwardly into pivotal connection with a horizontal actuating rod 12a, the other arm 17a of said intermediate lever'being shown vas projecting upwardly andk forwardly into pivotal connection with one 'end of a curved locking arm 20a, provided with a notch 22, adapted to engage projections 23, 24, and normally held in engaging position by resilient means such as the spring 25. The upward movement of the free end of the lookin arm 20 being limited either by contact with a pro'ection 23, 24,01' by its contact, at 29, wit a downwardly projecting portion 30 of the said intermediate lever, when this last described construction is employed, it will be obvious that, as before, a slight rearward movement of the handle 11 may be effective to cause a disengagement of the said locking arm from projections 23-01' 24, to cause the dumping of a load in either of the manners above described; and also that a forward movement of the hand lever 11 may be effective, as before, to cause a downward tilting of my scraper bowl, to pick up a load, the bowl being in this case tilted upon its pivots 4, and the,

locking arms 20a being moved backward in the general direction of their length. As will be appreciated upon an inspection of Fig. 5, the linear relationshi between the pins 23 and the pivots 31, ywhich the intermediate lever is connected to the 105king arm 20a, the rockshaft of this intermediate lever being normally below aline connecting the said pins and the said ivots,

the parts referred to may be regar ed as in the posltlons' normally selflretainin shown, although, as be ore, some play may advantageously be' permitted, as by providin a short horizontal slot 32 in one or the other of the elements connected by the pivot in 31. p Although I have herein describedtwo alternative embodiments of my invention, it should ybe understood that 4various features of my invention may be independently employed, and also that various modifications may be made therein, without departure from'the spint and scope of my 1nvention as the same is indicated above and in the following claims, and it should also be clearly understood that, althou h I have mentioned the bowl of the Fresno scraper, any similar or preferred bowl may be utilized in a construction permitting the same to roll completely over andthen automatically assume a position adapting it to be loaded upon the movement of a hand lever.

lVhat I claim is:

1. In a rotary scraper, a bowl having one flat side with a cutting edge at the front of the flat side and having solid ends, arcuate shoes connected to the solid ends and forming substantially a circle exce t atthe fiat side of the bowl, pivots exten ing outwardly from the solid ends at the center of the circle of the shoes, a main frame having parallel rear ends attached to said pivots and having converging intermediateI portions connected together and having parallel ends extending from the connected portions and attached to a hitch plate, a' rock shaft mounted in the rear, parallel portions in front of the rotating scraper, a crank arm fixed upon the'center of the rock shaft and extending upwardly, a link connected to the upper end of the cranlfarm and extending forwardly, a hand lever connected to the. forward ends of the frame and'to the link so that by operating the hand lever the rock shaft is rotated back and forth, lever arms fixed upon the ends of the rock shaft and extending substantially horizontally and backwardly and having lower cam faces, locking varms pivotally connected to the frame in front of the rock shaft and extending downwardly and backwardly and having notches in their upper faces and at their rear ends, pins fixed in the ends of the rotary Scraper and adapted to engage in the notches of the locking arms, springs connecting the locking arms to the frame, and cam faces upon the locking arms to be engaged by the cam faces'4 upon the lever arms carried by the rock shaft soV that when the hand lever vis pushed backwardly the cams of the lever arms will push the locking arms against the tension of the springs to release the v pins from the'notches in the locking arms.

2. In a rotary scraper, a bowl having one Hat side with a cutting edge at the front ot the flat side and having solid ends, arcuate shoesconnected to the solid ends and forming substantially a circle except aty the flat side of the bowl, pivots vextending outwardly from the solid ends at the center of the circle, a frame mounted upon the pivots and extending forwardly, a rock shaft mounted in the frame in front of the rotating scraper, a crank arm fixed upon the center of the rock shaft and extending upwardly, a hand lever mounted at the forward end of the frame, va link connecting the hand lever to the crank arm, lever arms fixed upon the ends of the rock shaft and extending backwardly and havinglower cam faces locking arms pivotally connected to the frame 1n front of the rock shaft and extending downwardly and backwardly and having notches in their upper faces at their rear ends and having cams to engage the cam faces of the lever arms, pins fixed in the ends of the rotary scraper and adapted to engage in the notches of the locking arms, springs connecting the locking arms to the frame, straps pivotally mounted upon the pivots and extending forwardly and pivotally connected to the lever arms, there being means forming lost motion between the rock shaft through the lever arms and straps to the pivots, and there being means forming lost motion between the pivots and the frame. l

3. In a rotary scraper, a bowl having a Hat cutter and circular ends except to the extent of the flat cutter, a frame in which the bowl is rotatable mounted, two set of alined pins extending from the ends of the rotary cutter, lookin arms pivotally connected to the v frame an having notches to receive the pins and means for operating the locking arms to allow the, scraper to rotate from one set of pins to the next.

4. In a* rotary scraper, a bowl having a fiat cutter and bottom and circular ends except to the extent of the fiat cutter, a frame including draft members having slots, ivots extending from the ends of the bow into the slots, locking arms pivotally connected to the frame and extending downwardly and backwardly and having notches in the upper sides of their rear ends, pins extending from the ends of the bowl and adapted i to engage in the notches of the locking arms,

and'manual means for moving the bowl forwardly to the extent of the slots in the draft members to tilt the cutter to dig into the ground, the cutter being drawn by the locking arms and pins, and so that when the manual means is released and a load,

picked up the pivots will move backwardly in the slots and the cutter will assume a level position.

5. In a rotary scraper, a frame includin draft members having slots, a bowl mounte between the f,draft members and having a fiat cutter and bottom and circular ends, except to the extent of the fiat' cutter and bottom, pivots extending from the ends ofv the bowl into the slots, locking arms pivotally connected .to the frame and extending backwardly and downwardly and having notches inthe up er sides of their rear ends, pins extendingr om the ends of the bowl and adapted to engage in the notches of the locking arms, manual means for allowing the bowl to rotate to bring the pms into the notches, manual means for moving the bowl forwardly with the pivots sliding forwardly in the slots to tilt the flat cutter and bottom, the bowl being` drawn at this time by the-pins in the notches, and so that when the manual means is released and a load picked u by the bottom the pivots will move bac rwardly in the slots and bring the bottom to a level position.

6. In a notary scraper, a bowl having a flat cutter and bottom, means for mounting and controlling the bowl to rotate forward ly from one operation to another, and means for shifting the line of draft from the pivots of the bowl to-the forward part of the cutter and tilting the' cutter and bottom to pick up a load and then allowin the weight of the load to move the bowl plvots backwardly in the slots ,and cause the bottom to assume a level position. l

7. In a rotary scraper, a bowl having a flat cutter and bottom and circular ends except to Ithe extent of the flat cutter and bottom, and having axial pivots extending from its endsy means forming a prima draft rigging mounted upon the pivots wit a limited forward and backward movement, pins extending from the ends of the bowl, a secondary draft rigging leading to the pins to be connected and disconnected, and a manually loperated means for shifting the load from the primary draft rigging to.

the secondary draft rigging at the time the cutter is to dig into the round so as to shift-the line of draft to t e cnt ter at the time the cutter is doing its hardest work.

8. In a rotary scraper, a bowl havin a cutter and bottom, pivot -pins extendmg from the axial centers of the ends of the bowl, means forming a primary draft rigging connected to the pivot pins with lost motion, means forming` a secondary draft rigging, pins extending from the ends of the bowl and adapted to lock and unlock with erated means for s lfting the line of draft from the primary draft rigging to the secondary draft rigging. n

In testimony whereof I have signed my name to this specification.

ROE C. HAWKINS.

l.the secondary draft riggin and manual 

